“You can keep it a secret.... But secrets have their own weight, and it can be a very heavy one.”
“Keeping big secrets, particularly secrets about things of one's own doing, is a tough proposition for even very bright people.”
“One person can keep a secret, but not two.”
“two can keep a secret if one of them is dead.”
“How can you expect another to keep a secret if we have been unable to keep it ourselves?”
“Only two can keep a secret if one of them is dead.”